US5694195A - Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability - Google Patents
Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability Download PDFInfo
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- US5694195A US5694195A US08/315,598 US31559894A US5694195A US 5694195 A US5694195 A US 5694195A US 31559894 A US31559894 A US 31559894A US 5694195 A US5694195 A US 5694195A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/01—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to unsaturated polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
- C08F299/04—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/01—Hydrocarbons
Definitions
- the present invention is directed to polyester resin-based compositions and methods of manufacturing and using cured, polymeric articles, and coatings therefrom.
- the compositions and methods are especially useful in the manufacture of ophthalmic lenses.
- the present invention is directed to unsaturated polyester-based polymeric articles, particularly unsaturated polyester-based ophthalmic lenses, that have improved optical uniformity (or lower optical distortion) and increased tint speed, while maintaining "water-white" color over time.
- the lenses are characterized by a relatively high index of refraction (at least about 1.5 and preferably at least about 1.56) and relatively low density, particularly below about 1.3 grams/cc, e.g., 1.24 grams/cc.
- Plastic materials have been used for the manufacture of ophthalmic lenses for many years. Plastics offer advantages to the patient over glass, most noticeably in their lower densities, allowing for a lighter lens, and greater impact strength. Conversely, plastic lenses can exhibit disadvantages: they tend to scratch more easily, have higher levels of chromatic aberration (lower ABBE values), and may distort at higher temperature processing conditions, due to lower glass transition (Tg) temperatures, resulting in "warped" lenses, or lenses with high levels of optical distortion. Additionally, plastic lenses usually have lower index of refraction values when compared to glass, which tends to require lenses of increased thickness and reduced cosmetic appeal.
- the standard "CR-39" type lens made from diethylene glycol bis(allyl carbonate), has an index of refraction of 1.498.
- Lenses which are "hazy” are obviously unacceptable to the patient. Color is also of concern both from the standpoint of having a "water-white” quality for best cosmetic appeal when the lens is first purchased, as well as maintenance of that color over time, e.g., being resistant to the effects of sun light, which over time can cause the lens to turn yellow.
- Lack of optical distortion requires a material having a relatively high ABBE number such that chromatic aberration is minimized; and, more importantly, a material having excellent uniformity in composition such that the occurrence of visible "waves" is minimized.
- ophthalmic lenses are manufactured in semi-finished form and shipped to optical laboratories where the prescription is "ground in”. With ever increasing emphasis on short optical lab turn-around times, e.g., 1 hour service, the ability of the lens material to rapidly accept fashion tints is important.
- the front surface of the lens may have a scratch resistant coating which does not accept tint.
- the only route for tinting to occur may be the parent lens material on the back surface. This material must be tintable.
- plastic ophthalmic lenses have been fabricated from a variety of materials including polycarbonate and polymethylmethacrylate, as well as polymerized allylic compounds, epoxies, and urethanes.
- the most common plastic ophthalmic lens is made from diethylene glycol bis(allyl carbonate) often referred to as "CR-39" (a specific product manufactured by PPG Industries).
- CR-39 diethylene glycol bis(allyl carbonate)
- this material has a refractive index of 1.498. It is easily processed in optical laboratories, is able to be manufactured with low optical distortion and is readily tinted by various commercially available tinting dyes.
- polyester materials to produce ophthalmic lenses has been previously disclosed in various U.S. patents. Examples of such disclosures are U.S. Pat. Nos. 3,391,224 and 3,513,224.
- U.S. Pat. No. 3,391,224 discloses a composition in which a polyester is combined with from 5 to 20 weight percent methyl methacrylate and less than 5 weight percent styrene to produce a thermosetting product which can be used to produce an ophthalmic lens.
- 3,513,224 discloses a composition in which 70 to 75 weight percent of a specific unsaturated polyester formed from the reaction of fumaric acid with triethylene glycol and 2,2-dimethyl-1,3-propanediol (otherwise known as neopentyl glycol) is combined with about 12 to 18 weight percent styrene and 8 to 12 weight percent ethylene glycol dimethacrylate.
- the styrene raises the index of refraction to approximately 1.52, and the ethylene glycol dimethacrylate reduces brittleness of the polymer.
- Polymerization of the polyester resin system can be carried out in a number of ways. Quite common is the use of a system promoted with a material such as cobalt octoate or cobalt naphthenate. When used with methyl ethyl ketone peroxide, the system can be cured near room temperature. Other free radical polymerization techniques also can be used, including thermal curing using peroxides or diazo compounds, as well as photoinitiated curing using compounds selected from the following classes of photoinitiators: benzoin ethers, benzophenones, thioxanthones, ketals, acetophenones, and phosphine oxides.
- Polyester resins can be manufactured using different compositions to achieve a wide variety of physical properties (hard, soft, rigid, flexible, and the like).
- Typical commercial polyesters include those made from a variety of glycols and acids.
- Common glycols used in alkyd polyester synthesis include: ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, and the like.
- Common acids used include: phthalic anhydride, isophthalic acid, adipic acid, and the like, used in conjunction with maleic anhydride and/or fumaric acid to provide unsaturation for cross-linking, usually with styrene or other diluent monomers.
- Resins made using phthalic anhydride are commonly called “ortho resins”; those made with isophthalic acid are commonly referred to as “iso resins”.
- iso resins With respect to properties desirable for making ophthalmic lenses, typical iso resins which have good scratch resistance are generally quite slow to tint. Typical ortho resins, on the other hand, are generally more scratch-prone, but tint more readily. All of the unsaturated polyester resins have a propensity to polymerize somewhat non-uniformly causing internal optical distortion or visible "waves".
- styrene is commonly used as a cross-linking diluent monomer with unsaturated polyester compositions. As the portion of styrene is increased, the index of refraction also increases. However, the presence of higher concentrations of styrene also tends to cause a higher degree of exotherm within the polymerizing composition leading to the formation of optical distortion within the lens. Improving optical uniformity (lowering optical distortion) and increasing tint speed in an unsaturated polyester resin-based ophthalmic lens composition, while maintaining a high index of refraction and color, therefore, is a daunting task.
- the present invention is directed to unsaturated polyester resin-based compositions that are modified for unexpected improvement in uniform, low optical distortion and/or improved tint speed by the addition of one or more additives selected from a monomeric allylic ester and/or an acrylate monomer or oligomer (weight average molecular weight below about 1,000), together with an exotherm depressant, making the modified polyester resin-based composition commercially viable for casting ophthalmic lenses.
- the additive(s) and exotherm depressant are useful to modify the polyester for sufficient improvement in reducing optical distortion and/or improving tint speed such that any unsaturated polyester resin capable of producing a relatively clear or colorless casting will be improved sufficiently to provide a composition having the required properties for an ophthalmic lens.
- the additive will need to include a color enhancing dye to arrive at optimum lens color.
- one aspect of the present invention is to provide unsaturated polyester resin-based compositions, including an exotherm depressant, such as alpha-methyl styrene, and an additive selected from an allylic ester, an acrylate monomer, and mixtures thereof, having improved optical uniformity and/or increased tinting speed.
- an exotherm depressant such as alpha-methyl styrene
- an additive selected from an allylic ester, an acrylate monomer, and mixtures thereof, having improved optical uniformity and/or increased tinting speed.
- Another aspect of the present invention is to provide a method of manufacturing ophthalmic lenses by polymerizing and curing a polyester resin-based composition within a mold cavity, said composition containing an exotherm depressant and an additive selected from an allylic ester, an acrylate monomer, and mixtures thereof, whereby the curing cycle temperatures are increased in essentially uniform steps, between about 80° F. and about 200° F., preferably between about 95° F. and about 190° F. over a period of time of at least about 7 hours to about 20 hours, more preferably about 12 hours to about 18 hours. After completion of this curing cycle, the lenses exhibit excellent optical uniformity.
- Another aspect of the present invention is to provide a method of manufacturing ophthalmic lenses by polymerizing and curing a polyester resin-based composition within a curved mold cavity, wherein the composition includes an exotherm depressant to slow the rate of polymerization, and at least two thermal polymerization initiators.
- One initiator e.g., di-(4-tert-butylcyclohexyl) peroxydicarbonate, is effective to initiate polymerization over a lower, polymerization temperature range, e.g., from about 95° F.
- a second thermal initiator e.g., tert-butyl peroxy-2-ethyl hexanoate, is effective to initiate polymerization over an upper portion of the polymerization and curing temperature range, e.g., from about 150° F. to about 190° F.
- compositions of the present invention include an unsaturated polyester resin as a predominant portion of the composition (more than 50% by weight, preferably more than about 70% by weight, e.g., about 70% to about 85% by weight of the composition).
- unsaturated polyesters are well known and can be manufactured by the reaction of one or more polyols with one or more polycarboxylic acids, with olefinic unsaturation being provided by one or more of the reactants, usually the acid.
- the resultant unsaturation in the polyester enables these resins to form thermosetting, cross-linked reaction products with compounds that contain olefinic double bonds, such as styrene and/or methyl methacrylate.
- unsaturated polyesters which can be used in accordance with the present invention include the reaction products of one or more saturated or unsaturated dicarboxylic acids, or their ester-forming derivatives, with a saturated or a vinyl-group-containing polyhydric alcohol.
- Suitable unsaturated dicarboxylic acids include maleic acid, fumaric acid, citraconic acid, itaconic acid, meconic acid, and anhydrides thereof, lower alkyl esters or acid halides thereof.
- saturated dicarboxylic acids include aliphatic dicarboxylic acids, such as malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, pimelic acid, or sebacic acid; and aromatic dicarboxylic acids, such as orthophthalic acid, terephthalic acid, isophthalic acid, m,p-diphenyl dicarboxylic acid, and diphenic acid; and anhydrides of these acids, such as phthalic anhydride and maleic anhydride, lower alkyl esters or acid halides of these acids, and mixtures thereof.
- aliphatic dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, pimelic acid, or sebacic acid
- aromatic dicarboxylic acids such as orthophthalic acid, terephthalic acid, isophthalic acid, m,p-diphenyl dicar
- suitable polyols include ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, diethylene glycol, dipropylene glycol, triethylene glycol, poly(ethylene glycol)s and mixtures thereof.
- the base polyester resin used in the compositions and methods of the present invention should have a number average molecular weight in the range of about 1,000 to about 5,000, preferably about 1,500 to about 4,000, and should be without haze. Suitable unsaturated polyesters having such properties are well known in the art.
- the base polyester can be a polyester formed by the reaction of propylene glycol, phthalic anhydride and maleic anhydride, such as the "S-40" unsaturated polyester disclosed in Bright U.S. Pat. No. 5,319,007.
- the composition disclosed in the Bright patent includes a phenoxyethyl acrylate, which is not included as an acrylate additive in accordance with the present invention.
- Another suitable unsaturated polyester is formed by the reaction of maleic anhydride, orthophthalic anhydride and propylene glycol, such as "Aropol L-2506-15" of Ashland Chemical Co., also disclosed in the above-identified Bright U.S. Pat. No. 5,319,007.
- polyester resins useful in accordance with the present invention are shown in the following examples and are the reaction products of one or more acids or anhydrides selected from phthalic acid, isophthalic acid, maleic acid, phthalic anhydride, maleic anhydride, and particularly mixtures of two or more of such acids or anhydrides, with a polyol selected from ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, and neopentyl glycol, preferably two or more of those glycols, having a number average molecular weight in the range of about 1,500 to about 4,000.
- acids or anhydrides selected from phthalic acid, isophthalic acid, maleic acid, phthalic anhydride, maleic anhydride, and particularly mixtures of two or more of such acids or anhydrides
- a polyol selected from ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, and neopentyl glycol, preferably two or more of those glyco
- One of the most difficult problems encountered in attempting to formulate a polyester resin-based composition into a suitable ophthalmic lens formulation is that of providing the cast and cured composition with sufficient optical clarity, or freedom from optical distortion.
- the reactants used to form the resin are introduced between spaced apart glass or metal mold surfaces and the mold sections are sealed together about their inner periphery by means of a non-reactive, resilient gasket or retainer ring. Since exothermic materials are employed, the mold outer surfaces are immersed in a cooling fluid, e.g., water, or otherwise cooled to dissipate the heat of polymerization and cross-linking from the mold cavity, and to maintain an optimum polymerization and curing temperature.
- a cooling fluid e.g., water
- the addition of an exotherm depressant to the unsaturated polyester resin-based composition results in a sufficiently reduced rate of reaction (polymerization proceeds slower over a longer period of time) to reduce the convection currents sufficiently to prevent visible "waves" or striations.
- the resulting cured, unsaturated polyester-based lens material has excellent optical uniformity, with low optical distortion.
- Suitable exotherm depressants for the unsaturated polyester-based compositions of the present invention include, for example, alpha-methyl styrene; terpinolene; gamma-terpinene; dilauryl thiodipropionate; 4-tert-butylpyrocatechol; and mixtures thereof.
- the exotherm depressant should be included in the composition in an amount of at least about 0.01% by weight of the composition, up to about 20% by weight, depending on the depressant used.
- Alpha-methyl styrene preferably is used in an amount in the range of about 2% to about 10% by weight, more preferably about 5.5% to about 7% by weight of the composition.
- the unsaturated polyester should include an additive selected from the group consisting of an allylic ester, an acrylate monomer, and mixtures thereof, to provide improved tint speed and/or improved optical uniformity.
- an additive selected from the group consisting of an allylic ester, an acrylate monomer, and mixtures thereof, to provide improved tint speed and/or improved optical uniformity.
- Any low color allylic ester and any low color acrylate monomer are suitable as the additive in accordance with the present invention.
- Suitable allylic esters include monoallylic esters, diallylic esters and triallylic esters, preferably an allylic ester selected from the group consisting of diallyl phthalate; diethylene glycol bis(allyl carbonate); triallyl cyanurate; and mixtures thereof.
- Other suitable allylic esters include allyl acrylate; allyl benzene; triallyl isocyanurate; diallyl maleate; diallyl diglycollate; dimethallyl maleate; allyl benzoate; diallyl adipate; and mixtures thereof.
- the allylic ester when incorporated as a composition additive, should be included in an amount in the range of about 1% to about 20%, based on the total weight of the polyester-based lens composition, preferably about 2% to about 10% by weight; and more preferably about 6% to about 10% by weight, with best results achieved at about 7.5% to about 9% by weight.
- improvements in optical distortion and/or speed of tinting can be achieved with either an allylic ester or an acrylate monomer, when used together with an exotherm depressant. Best results are achieved with a combination of an allylic ester and an acrylate monomer, particularly since the allylic ester also functions to increase the impact strength of the cross-linked polymer network, and the acrylate additionally functions to increase the abrasion resistance.
- Suitable acrylic monomers include monoacrylates, diacrylates, triacrylates, tetraacrylates, pentaacrylates, and the higher poly-functional acrylates.
- the preferred acrylate monomer is selected from the group consisting of methyl methacrylate; ethylene glycol dimethacrylate; 1,6 hexanediol diacrylate; trimethylolpropane polyoxyethylene triacrylate; dipentaerythritol pentaacrylate; and mixtures thereof.
- Suitable monofunctional acrylates include alkyl and substituted alkyl acrylates and methacrylates, such as ethyl acrylate; cyclohexyl methacrylate; 2-hydroxy ethyl methacrylate; 3-hydroxypropyl acrylate; and mixtures thereof.
- Additional suitable monofunctional acrylates and methacrylates include any haloalkyl acrylate and methacrylate, such as alpha-bromoethyl acrylate; alpha-chloroethyl acrylate; chloromethyl methacrylate; 2-bromoethyl methacrylate; and mixtures thereof.
- Aryl acrylates and methacrylates also are suitable as the composition additive, such as 2-naphthyl methacrylate; para-tolyl acrylate; and mixtures thereof.
- the haloaryl acrylates and methacrylates such as para-chlorophenyl methacrylate; meta-bromophenyl acrylate; 2,4,6-tribromophenyl acrylate; and mixtures thereof.
- benzyl acrylates and methacrylates which can be used as composition additives, in accordance with the present invention, include benzyl acrylate; benzyl methacrylate and their derivatives, such as para-chlorobenzyl methacrylate; meta-methoxybenzyl methacrylate; para-ethylbenzyl acrylate; and mixtures thereof.
- polyfunctional acrylates and methacrylates include the polyol diacrylates and dimethacrylates, such as neopentyl glycol diacrylate; polyethylene glycol (400) dimethacrylate; thiodiethylene glycol dimethacrylate; and mixtures thereof.
- Additional useful polyfunctional acrylates and methacrylates include the polyol polyacrylates and polymethacrylates, such as pentaerythritol triacrylate; glycerol triacrylate; trimethylolpropane triacrylate; tris(2-hydroxy ethyl) isocyanurate trimethacrylate; and the aliphatic and aromatic monofunctional and polyfunctional urethane acrylates and methacrylates; and mixtures thereof.
- the acrylate monomer when incorporated as composition additive, should be included in an amount in the range of about 1% to about 20%, based on the total weight of the polyester-based lens composition, preferably about 2% to about 10% by weight; and more preferably about 6% to about 10% by weight, with best results achieved at about 7.5% to about 9% by weight.
- the resulting lens will have a relatively high index of refraction (approximately 1.56), a relatively low density (approximately 1.24 grams/cc), and an acceptable ABBE value (approximately 34 to 37).
- the lens will have sufficient hardness to be able to be surfaced with commonly used optical laboratory equipment.
- various ultra-violet absorbing materials such as Cyanamid Cyasorb UV5411; Ciba Geigy Tinuvin 234; and the like
- color-correcting dye(s) the lens can be made "water white” and will not appreciably yellow during exposure to sunlight.
- the test methodology was to cast semifinished lenses in different configurations.
- One group of semifinished lenses were cast with an approximately 8 diopter front curve and a 6 diopter back curve, an edge thickness of 9-12 mm, and a diameter of 75 mm.
- Another set of lenses were cast with 6 diopter front and back curves, an edge thickness of 9-12 mm, and a diameter of 75 mm.
- lenses were also cast with a 4 diopter front curve and 6 diopter back curve with an edge thickness of 9-12 mm, and a diameter of 75 mm. Amounts are percent by weight.
- the initiators were dissolved in approximately 1 wt % styrene. In all other cases, the initiators were dissolved in the additive composition.
- the resulting lenses from each test were evaluated for the presence of visible optical distortion ("waves"). If each of the configurations of lenses for a given test group had a majority of lenses without visible optical distortion, the rating was deemed to be "Excellent”. If one configuration had half or a majority of lenses with visible distortion, but the other configuration(s) had a majority without distortion, the rating was deemed to be “Good”. If two configurations had half or a majority of lenses with visible optical distortion and the third configuration had a majority without distortion, the rating was "Fair”. If all configurations had a majority of lenses with visible optical distortion, the rating was deemed to be "Poor".
- a lens was selected from each test group, processed to uniform thickness of approximately 1.5-2.0 mm. All lenses were tinted simultaneously in gray tinting solution (BPI Gray) for 5 minutes at approximately 200° F. Those lenses exhibiting a percent transmission of visible light after tinting of greater than or equal to 65% transmission were rated "V. Slow”; 55%-64%: “Slow”; 45%-54%: “Medium”; 35%-44%: “Fast”; less than or equal to 34% transmission were rated as "V. Fast".
- Hardness was measured on lenses from each test group using a Barber Colman type 935 machine. A rating of 80 or more is deemed to be acceptable.
- Examples 1 through 4 demonstrate the properties of polyester lenses made from the initiated resin.
- Resins A and B are ortho type resins, while resins C and D are iso resins.
- Example 5 demonstrates the use of an additive composition to improve the optical clarity of resin C from a "Poor” rating to "Good".
- the additive comprised approximately 22 wt % of the total formulation.
- the additive consisted of triallyl cyanurate (46%) combined with trimethylolpropane polyoxyethylene triacrylate (18%) and alpha-methyl styrene (36%) as the exotherm depressant.
- Example 6 demonstrates the use of a different additive composition to improve the optical clarity of resin B from a "Poor” rating to "Excellent".
- the allyl compound is diallyl phthalate (31%)
- the acrylate is 1,6 hexanediol diacrylate (31%)
- the exotherm depressant is alpha-methyl styrene (38%).
- Examples 7 and 8 show the same additive package used in Example 6 with the two iso resins, C and D. Slight improvements were noted for both optical clarity ("Poor” improved to “Fair”) and tint speed. Resin C composition changed from “V. Slow” to “slow” and resin D composition changed from “Medium” to “Fast”.
- Example 9 shows the effect of a different composition of additive where the allyl compound is diethylene glycol bis(allyl carbonate) (50%) blended with the alpha-methyl styrene (50%) exotherm depressant, and without an acrylate monomer.
- the additive was 19 wt % of the formulation. A dramatic improvement in tint speed was noted. The rating improved from “Medium” to “Very Fast”.
- Example 10 shows the effect on improving the tint speed of resin A of a mixture of methacrylates and an acrylate, with an alpha-methyl styrene exotherm depressant, and no allylic ester.
- the composition was ethylene glycol dimethacrylate (40%), dipentaerythritol pentaacrylate (23%), methyl methacrylate (27%) and alpha-methyl styrene (10%).
- the tint improved from a "Medium” rating to "Fast”.
- Example 11 demonstrates a dramatic improvement in tint rate for resin A with a mixture of diallyl phthalate (75%) and alpha-methyl styrene (25%), without an acrylate monomer, comprising 10% of the formulation total.
- the tint speed increased from “Medium” to “Very Fast”.
- Example 12 shows a good improvement in the optical clarity and tint rate of resin A by varying the composition additive of Example 11 to diallyl phthalate (25%) and alpha-methyl styrene (75%), the mixture still comprising 10% of the total formulation.
- the optical clarity improved from “Good” to “Excellent” and the tint improved from “Medium” to “Fast”.
- Example 13 demonstrates the use of ethylene glycol dimethacrylate (25%) and alpha-methyl styrene (75%) to generate the same improvement in optical clarity of resin A as shown by the mixture used in Example 12; however the tint speed is somewhat reduced.
- Examples 14 through 16 show the effect of varying the additive percentage of the whole formulation.
- the additive is a mixture of diethylene glycol bis(allyl carbonate) (36%), dipentaerythritol pentaacrylate (14%), methyl methacrylate (23%) and alpha-methyl styrene (27%).
- the tint speed increases from "Medium” to "Fast”.
- the tint speed increases further to "V. Fast”, but reduction in optical clarity and hardness is noted.
- Examples 17 through 20 show the effect of varying the percentage of a different additive composition to the whole formulation.
- the additive is a mixture of diallyl phthalate (36%), ethylene glycol dimethacrylate (14%), methyl methacrylate (23%) and alpha-methyl styrene (27%).
- the tint speed has increased from “Medium” to “Fast” and the optical clarity has improved to "Excellent”.
- the optical clarity continues to be “Excellent” while the tint speed increases further to "V. Fast”.
- the hardness of this composition is approaching an unacceptably soft level.
- Example 21 Another composition is shown in Example 21.
- Example 21 not only offers great economical advantage for manufacturing lenses of 1.56 refractive index at low material costs, but the resultant lens product also possesses good mechanical performance, good optical quality, and water-white color, all of which are describe characteristics for the ophthalmic lens market.
- the viscosity of the composition is 250 centipoises at 25° C. which can be easily handled by the conventional mixing, filtering and pouring devices.
- the heat cure cycle given below, the following physical properties of the uncoated lenses were obtained:
- Example 21 The formulation of Example 21 was initiated with 0.5 wt % Perkadox 16S and 1.0 wt % Trigonox 21C50.
- the preferred cure cycle for the composition is:
- Example 22 Another excellent composition is shown in Example 22.
- Example 22 The formulation of Example 22 was initiated with 0.5 wt % Perkadox 16S and 0.71 wt % Trigonox 21C50.
- the preferred cure cycle for the composition is:
- the physical properties of the lenses made from this composition and cure cycle are:
- the lenses from this composition exhibit improved optical uniformity over those from Example 21 while maintaining good mechanical performance and color.
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Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/315,598 US5694195A (en) | 1994-09-30 | 1994-09-30 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
JP8511824A JPH10507006A (ja) | 1994-09-30 | 1995-09-14 | ポリエステルレジンをベースとした、光学的均一性及び/又は着色性に優れた高屈折率の眼鏡レンズ |
EP95933095A EP0783710B1 (de) | 1994-09-30 | 1995-09-14 | Linse zur korrektur von fehlsichtigkeiten aus polyersterharz mit hohem brechungsindex, erhöhter optischer uniformität und/oder verbesserter einfärbbarkeit |
AU35881/95A AU688137B2 (en) | 1994-09-30 | 1995-09-14 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
KR1019970702031A KR100506300B1 (ko) | 1994-09-30 | 1995-09-14 | 폴리에스테르수지계,광학균일도및/또는착색성이우수한고굴절안경렌즈 |
ES95933095T ES2173969T3 (es) | 1994-09-30 | 1995-09-14 | Lentes oftalmicas de alto indice basadas en resina de poliester con mejor uniformidad optica y/o el coloreamiento. |
CN95195381A CN1092798C (zh) | 1994-09-30 | 1995-09-14 | 改善了光学均匀性和/或着色性的聚酯树脂基高折射率眼镜片 |
RU97106750A RU2142151C1 (ru) | 1994-09-30 | 1995-09-14 | Полимерная композиция для получения контактных линз, способ изготовления контактных линз и способ улучшения видимости объекта человеческим глазом, снабженным этой контактной линзой |
BR9509180A BR9509180A (pt) | 1994-09-30 | 1995-09-14 | Lentes oftálmicas de alto índice de resina a base de poliester tendo melhorado uniformidade óptica e/ou tintabilidade |
MX9702238A MX9702238A (es) | 1994-09-30 | 1995-09-14 | Lentes oftalmicos de alto indice de refraccion con base de resina de poliester que tienen uniformidad optica y/o capacidad de teñido mejorado. |
PCT/US1995/011623 WO1996010760A1 (en) | 1994-09-30 | 1995-09-14 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
DE69526861T DE69526861T2 (de) | 1994-09-30 | 1995-09-14 | Linse zur korrektur von fehlsichtigkeiten aus polyersterharz mit hohem brechungsindex, erhöhter optischer uniformität und/oder verbesserter einfärbbarkeit |
US08/874,189 US5886764A (en) | 1994-09-30 | 1997-06-13 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
US08/884,076 US5852112A (en) | 1994-09-30 | 1997-06-27 | Polyester resin-based high index ophthalmic lenses having improved optical unformity and/or tintability |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/315,598 US5694195A (en) | 1994-09-30 | 1994-09-30 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/874,189 Continuation US5886764A (en) | 1994-09-30 | 1997-06-13 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
US08/884,076 Division US5852112A (en) | 1994-09-30 | 1997-06-27 | Polyester resin-based high index ophthalmic lenses having improved optical unformity and/or tintability |
Publications (1)
Publication Number | Publication Date |
---|---|
US5694195A true US5694195A (en) | 1997-12-02 |
Family
ID=23225176
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/315,598 Expired - Lifetime US5694195A (en) | 1994-09-30 | 1994-09-30 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
US08/874,189 Expired - Lifetime US5886764A (en) | 1994-09-30 | 1997-06-13 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
US08/884,076 Expired - Lifetime US5852112A (en) | 1994-09-30 | 1997-06-27 | Polyester resin-based high index ophthalmic lenses having improved optical unformity and/or tintability |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/874,189 Expired - Lifetime US5886764A (en) | 1994-09-30 | 1997-06-13 | Polyester resin-based high index ophthalmic lenses having improved optical uniformity and/or tintability |
US08/884,076 Expired - Lifetime US5852112A (en) | 1994-09-30 | 1997-06-27 | Polyester resin-based high index ophthalmic lenses having improved optical unformity and/or tintability |
Country Status (12)
Country | Link |
---|---|
US (3) | US5694195A (de) |
EP (1) | EP0783710B1 (de) |
JP (1) | JPH10507006A (de) |
KR (1) | KR100506300B1 (de) |
CN (1) | CN1092798C (de) |
AU (1) | AU688137B2 (de) |
BR (1) | BR9509180A (de) |
DE (1) | DE69526861T2 (de) |
ES (1) | ES2173969T3 (de) |
MX (1) | MX9702238A (de) |
RU (1) | RU2142151C1 (de) |
WO (1) | WO1996010760A1 (de) |
Cited By (12)
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US5992997A (en) * | 1995-02-12 | 1999-11-30 | Akzo Nobel Nv | Ophthalmic lenses |
US20040041132A1 (en) * | 2002-08-30 | 2004-03-04 | Engardio Thomas J. | Photochromic matrix compositions for use in ophthalmic lenses |
US6863848B2 (en) | 2002-08-30 | 2005-03-08 | Signet Armorlite, Inc. | Methods for preparing composite photochromic ophthalmic lenses |
US11529230B2 (en) | 2019-04-05 | 2022-12-20 | Amo Groningen B.V. | Systems and methods for correcting power of an intraocular lens using refractive index writing |
US11564839B2 (en) | 2019-04-05 | 2023-01-31 | Amo Groningen B.V. | Systems and methods for vergence matching of an intraocular lens with refractive index writing |
US11583388B2 (en) | 2019-04-05 | 2023-02-21 | Amo Groningen B.V. | Systems and methods for spectacle independence using refractive index writing with an intraocular lens |
US11583389B2 (en) | 2019-04-05 | 2023-02-21 | Amo Groningen B.V. | Systems and methods for correcting photic phenomenon from an intraocular lens and using refractive index writing |
US11667742B2 (en) | 2019-05-03 | 2023-06-06 | Johnson & Johnson Surgical Vision, Inc. | Compositions with high refractive index and Abbe number |
US11678975B2 (en) | 2019-04-05 | 2023-06-20 | Amo Groningen B.V. | Systems and methods for treating ocular disease with an intraocular lens and refractive index writing |
US11708440B2 (en) | 2019-05-03 | 2023-07-25 | Johnson & Johnson Surgical Vision, Inc. | High refractive index, high Abbe compositions |
US11795252B2 (en) | 2020-10-29 | 2023-10-24 | Johnson & Johnson Surgical Vision, Inc. | Compositions with high refractive index and Abbe number |
US11944574B2 (en) | 2019-04-05 | 2024-04-02 | Amo Groningen B.V. | Systems and methods for multiple layer intraocular lens and using refractive index writing |
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EP0795765B1 (de) * | 1996-03-13 | 2002-09-25 | Tokuyama Corporation | Photopolymerisierbare Zusammensetzung und gehärtete, transparente Gegenstände |
US6099123A (en) * | 1997-09-04 | 2000-08-08 | Signet Armorlite, Inc. | Production of photopolymerized polyester high index ophthalmic lenses |
US6450642B1 (en) * | 1999-01-12 | 2002-09-17 | California Institute Of Technology | Lenses capable of post-fabrication power modification |
WO2001092414A1 (fr) * | 2000-05-31 | 2001-12-06 | Tokuyama Corporation | Composition durcissable et article a traitement photochrome |
DE60119099D1 (de) * | 2000-06-16 | 2006-06-01 | Showa Denko Kk | Herstellung von alicyclischen (meth)allylestern für kunststofflinsenzusammensetzungen |
EP1455200A4 (de) * | 2001-11-30 | 2005-09-28 | Nikon Corp | Precursor-zusammensetzung für ein optisches harz, harz zur optischen verwendung; optisches element und optische artikel |
US6835333B2 (en) * | 2002-05-07 | 2004-12-28 | Milliken & Company | Combinations for use as toners in polyesters |
US7488510B2 (en) * | 2003-10-28 | 2009-02-10 | Signet Armorlite, Inc. | Compositions and methods for the preparation of composite photochromic polycarbonate lenses |
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JP4935971B2 (ja) * | 2005-01-31 | 2012-05-23 | Dic株式会社 | 賦形用活性エネルギー線硬化型樹脂組成物、賦形用シートおよび賦形物 |
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5992997A (en) * | 1995-02-12 | 1999-11-30 | Akzo Nobel Nv | Ophthalmic lenses |
US20040041132A1 (en) * | 2002-08-30 | 2004-03-04 | Engardio Thomas J. | Photochromic matrix compositions for use in ophthalmic lenses |
US6863844B2 (en) | 2002-08-30 | 2005-03-08 | Signet Armorlite, Inc. | Photochromic matrix compositions for use in ophthalmic lenses |
US6863848B2 (en) | 2002-08-30 | 2005-03-08 | Signet Armorlite, Inc. | Methods for preparing composite photochromic ophthalmic lenses |
US11583388B2 (en) | 2019-04-05 | 2023-02-21 | Amo Groningen B.V. | Systems and methods for spectacle independence using refractive index writing with an intraocular lens |
US11564839B2 (en) | 2019-04-05 | 2023-01-31 | Amo Groningen B.V. | Systems and methods for vergence matching of an intraocular lens with refractive index writing |
US11529230B2 (en) | 2019-04-05 | 2022-12-20 | Amo Groningen B.V. | Systems and methods for correcting power of an intraocular lens using refractive index writing |
US11583389B2 (en) | 2019-04-05 | 2023-02-21 | Amo Groningen B.V. | Systems and methods for correcting photic phenomenon from an intraocular lens and using refractive index writing |
US11678975B2 (en) | 2019-04-05 | 2023-06-20 | Amo Groningen B.V. | Systems and methods for treating ocular disease with an intraocular lens and refractive index writing |
US11931296B2 (en) | 2019-04-05 | 2024-03-19 | Amo Groningen B.V. | Systems and methods for vergence matching of an intraocular lens with refractive index writing |
US11944574B2 (en) | 2019-04-05 | 2024-04-02 | Amo Groningen B.V. | Systems and methods for multiple layer intraocular lens and using refractive index writing |
US11667742B2 (en) | 2019-05-03 | 2023-06-06 | Johnson & Johnson Surgical Vision, Inc. | Compositions with high refractive index and Abbe number |
US11708440B2 (en) | 2019-05-03 | 2023-07-25 | Johnson & Johnson Surgical Vision, Inc. | High refractive index, high Abbe compositions |
US11958923B2 (en) | 2019-05-03 | 2024-04-16 | Johnson & Johnson Surgical Vision, Inc. | Compositions with high refractive index and abbe number |
US11795252B2 (en) | 2020-10-29 | 2023-10-24 | Johnson & Johnson Surgical Vision, Inc. | Compositions with high refractive index and Abbe number |
Also Published As
Publication number | Publication date |
---|---|
DE69526861D1 (de) | 2002-07-04 |
CN1092798C (zh) | 2002-10-16 |
US5852112A (en) | 1998-12-22 |
EP0783710A1 (de) | 1997-07-16 |
CN1164896A (zh) | 1997-11-12 |
AU688137B2 (en) | 1998-03-05 |
DE69526861T2 (de) | 2002-11-07 |
WO1996010760A1 (en) | 1996-04-11 |
ES2173969T3 (es) | 2002-11-01 |
BR9509180A (pt) | 1997-12-23 |
US5886764A (en) | 1999-03-23 |
KR100506300B1 (ko) | 2005-11-16 |
RU2142151C1 (ru) | 1999-11-27 |
MX9702238A (es) | 1997-06-28 |
KR970706511A (ko) | 1997-11-03 |
JPH10507006A (ja) | 1998-07-07 |
EP0783710B1 (de) | 2002-05-29 |
AU3588195A (en) | 1996-04-26 |
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